From 70e335e16882df5b5d6971022e63c3603a1e8c23 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Thu, 18 Feb 2010 11:25:22 +0200 Subject: KVM: Convert kvm->requests_lock to raw_spinlock_t The code relies on kvm->requests_lock inhibiting preemption. Noted by Jan Kiszka. Signed-off-by: Avi Kivity --- include/linux/kvm_host.h | 2 +- virt/kvm/kvm_main.c | 6 +++--- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 3145b281de9d..a3fd0f91d943 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -161,7 +161,7 @@ struct kvm_memslots { struct kvm { spinlock_t mmu_lock; - spinlock_t requests_lock; + raw_spinlock_t requests_lock; struct mutex slots_lock; struct mm_struct *mm; /* userspace tied to this vm */ struct kvm_memslots *memslots; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 0a360c26cc34..548f9253c195 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -138,7 +138,7 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) zalloc_cpumask_var(&cpus, GFP_ATOMIC); - spin_lock(&kvm->requests_lock); + raw_spin_lock(&kvm->requests_lock); me = smp_processor_id(); kvm_for_each_vcpu(i, vcpu, kvm) { if (test_and_set_bit(req, &vcpu->requests)) @@ -153,7 +153,7 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) smp_call_function_many(cpus, ack_flush, NULL, 1); else called = false; - spin_unlock(&kvm->requests_lock); + raw_spin_unlock(&kvm->requests_lock); free_cpumask_var(cpus); return called; } @@ -409,7 +409,7 @@ static struct kvm *kvm_create_vm(void) kvm->mm = current->mm; atomic_inc(&kvm->mm->mm_count); spin_lock_init(&kvm->mmu_lock); - spin_lock_init(&kvm->requests_lock); + raw_spin_lock_init(&kvm->requests_lock); kvm_eventfd_init(kvm); mutex_init(&kvm->lock); mutex_init(&kvm->irq_lock); -- cgit v1.2.3